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#include <libudev.h>
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <sys/epoll.h>
#include <stdbool.h>
#include <unistd.h>
#include <sys/types.h>
#include <string.h>
#include <sys/wait.h>
#include <signal.h>
#include <errno.h>
#include <wayland-client.h>
#define EPOLL_EVENTS 8
enum app_event {
EVENT_UDEV = 0,
EVENT_WAYLAND = 1,
EVENT_CHILD = 2,
};
enum app_state {
STATE_POLLING,
STATE_RUNNING,
STATE_FINISHED,
};
/*Open a connection with the current wayland compositor if it exists
* A fd is provided which can be polled. When polling the fd returns an error
* send a signal to any children and terminate.
*/
struct poll_phone {
enum app_state state;
pid_t child;
int pipe;
};
void app_abort(char *str) {
fprintf(stderr, "%s\n", str);
exit(-1);
}
static struct poll_phone app;
void run_scrcpy() {
assert(app.state != STATE_RUNNING);
pid_t pid = fork();
if(pid == 0) {
signal(SIGTERM, SIG_DFL);
signal(SIGINT, SIG_DFL);
/*There's a race condition with adb...*/
sleep(2);
execlp("scrcpy", "scrcpy", (char *) 0);
exit(-1);
} else if(pid == -1) {
app_abort("fork() error");
}
app.state = STATE_RUNNING;
app.child = pid;
}
void handle_term(int sig) {
signal(sig, SIG_IGN);
app.state = STATE_FINISHED;
}
void handle_child(int sig) {
char data[1] = {0};
app.state = STATE_POLLING;
if(write(app.pipe, data, 1) == -1) {
app_abort("write failed");
}
}
/*Refactor this so we poll the signal handlers*/
int main(int argc, char **argv) {
int fileds[2];
char buffer[128];
if(pipe(fileds) == -1) {
app_abort("Failled to create pipe.");
}
app.state = STATE_POLLING;
app.pipe = fileds[1];
app.child = -1;
signal(SIGTERM, handle_term);
signal(SIGINT, handle_term);
signal(SIGCHLD, handle_child);
struct epoll_event events[EPOLL_EVENTS];
struct epoll_event event;
struct wl_display *display = wl_display_connect(NULL);
if(!display) {
app_abort("Failled to connect to Wayland display.");
}
struct udev *_udev = udev_new();
if(!_udev) {
app_abort("Failed to allocate udev");
}
struct udev_monitor *_monitor = udev_monitor_new_from_netlink(_udev, "udev");
if(!_monitor) {
app_abort("Failed to allocate udev monitor");
}
udev_monitor_enable_receiving(_monitor);
int epfd = epoll_create(EPOLL_EVENTS);
if(epfd == -1) {
app_abort("Failed to create epoll");
}
event.events = EPOLLIN;
event.data.u32 = EVENT_UDEV;
epoll_ctl(epfd, EPOLL_CTL_ADD, udev_monitor_get_fd(_monitor), &event);
event.data.u32 = EVENT_WAYLAND;
epoll_ctl(epfd, EPOLL_CTL_ADD, wl_display_get_fd(display), &event);
event.data.u32 = EVENT_CHILD;
epoll_ctl(epfd, EPOLL_CTL_ADD, fileds[0], &event);
run_scrcpy();
while(app.state != STATE_FINISHED) {
int ready = epoll_wait(epfd, &events[0], EPOLL_EVENTS, -1);
if(ready > 0) {
for(int i = 0; i < ready; i++) {
struct epoll_event *event = &events[i];
switch(event->data.u32) {
case EVENT_UDEV: {
struct udev_device *device = udev_monitor_receive_device(_monitor);
const char *action = udev_device_get_action(device);
udev_device_unref(device);
if(!strcmp(action, "bind") && app.state == STATE_POLLING) {
run_scrcpy();
}
break;
}
case EVENT_WAYLAND:
if(wl_display_dispatch(display) == -1) {
app.state = STATE_FINISHED;
}
break;
case EVENT_CHILD:
{
if(read(fileds[0], buffer, 128) == -1) {
app_abort("Failed to read");
}
if(app.state != STATE_FINISHED) {
app.state = STATE_POLLING;
}
wait(NULL);
app.child = -1;
}
break;
}
}
}
}
kill(0, SIGTERM);
if(app.child != -1) {
pid_t r;
do {
r = wait(NULL);
} while (r != app.child && r > 0);
}
close(fileds[0]);
close(fileds[1]);
udev_monitor_unref(_monitor);
udev_unref(_udev);
return 0;
}
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